<!ELEMENT route (link_ctn*)>
<!ATTLIST route src CDATA #REQUIRED>
<!ATTLIST route dst CDATA #REQUIRED>
-<!ATTLIST route symmetrical (YES|NO) "YES">
+<!ATTLIST route symmetrical (YES|NO|yes|no) "YES">
<!ELEMENT ASroute (link_ctn*)>
<!ATTLIST ASroute src CDATA #REQUIRED>
<!ATTLIST ASroute dst CDATA #REQUIRED>
<!ATTLIST ASroute gw_src CDATA #REQUIRED>
<!ATTLIST ASroute gw_dst CDATA #REQUIRED>
-<!ATTLIST ASroute symmetrical (YES|NO) "YES">
+<!ATTLIST ASroute symmetrical (YES|NO|yes|no) "YES">
<!ELEMENT zoneRoute (link_ctn*)>
<!ATTLIST zoneRoute src CDATA #REQUIRED>
<!ATTLIST zoneRoute dst CDATA #REQUIRED>
<!ATTLIST zoneRoute gw_src CDATA #REQUIRED>
<!ATTLIST zoneRoute gw_dst CDATA #REQUIRED>
-<!ATTLIST zoneRoute symmetrical (YES|NO) "YES">
+<!ATTLIST zoneRoute symmetrical (YES|NO|yes|no) "YES">
<!ELEMENT link_ctn EMPTY>
<!ATTLIST link_ctn id CDATA #REQUIRED>